The package was designed as an extension of the
lastpage package — as well as that
package’s LastPage label
(created \AtEndDocument) it adds a VeryLastPage
(created \AfterLastShipout).

When more than one page numbering scheme is in operation (as in
a book class document with frontmatter), the labels above
do not give the total number of pages, so the package also
provides labels pagesLTS.<,
where the numbering scheme
is arabic, roman, etc.